Projection apparatus.



0 9 1 6 2 V 0 N D E T N E T A P W am 0 m. 2 7 00 0' N PROJECTION APPARATUS.

APPLIOATION FILED MAY 15, 1907.

7 UNiiED ,gTril jEti 'PriTEN WILLIAM L. PATTERSON, OF ROCHESTER, NEW YORK, ASSIGN OR TO BAUSCH (l: LOMB ()PTIGAL COMPANY, OF ROGHFSTER, NEW YORK, A CORPORATION OF NEW YORK.

PROJECTION APPARATUS.

Specification of Letters Patent.

Patented Nov. 26; 1907.

Application filed May 15.. 1907. Serial No. 873,774.

able source of light are concentretcd'or coni densed upon a suitable object, the inuige of which is projected upon a screen or into a camera. by a. microscope. In these apparatus, the object from which the image is formed consists in some instances of a specimen embedded in cement upon a. transparent plate, and as the heat produced by condensthe rays is very greet the cement is 1n softened and the specimen cooked, thereby causing the destruction of the plate.

It is an object of my invention to make provision for the arrangement of a cooling device in such relation to the object and to the microscope condenser that the dcstruction of these plates, which in many in stances are very valuable, is prevented.

To these and other ends the invention consists in certain improvements and combine.- tions of parts all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings: liigure 1 is a side elevation of a projection apparatus embodying my invention. Fig. 2 is an axial section of the cooling cell showing itsrelation to the stage'ancl the condensing system.

With extended reference to the drawings A indicstes a suitable illuminotor casing contsining a lamp of any desired type and dirooting the rays from the letter to a. main condensing system B which in turn is coir nect-ed to the bellows C, all suitably suportcd onen optical bench D. The front board 1 0f the bellows C has in the present instance, a. tube 2 projecting therefrom and serving as as up )ort or attaching means for the projection device herein shown. The .projeotion device, in this embodimentcon prises a microscope 3 moved by a suitable adjusting mechanism 3 to and from its stage l l 1 r i l I l 1 side of the stage is e substege 5 into which 1 preferably :[its a cooling device in the form of ,a liquid containing chamber or cell which-hi present instance comprises a control portion 6, at reduced portion 7 and an enlarged ortion 8 formed with u filling opening 9,the est two portions being arranged on opposite sides of the central portion so that when the letter is slidingly fitted into engagement with the inner wall of the substage, the reduced portion will project into the inner stage and the enlarged orlion will lie on, side of the sub-- stage wit 1 the wells .15) thereof forming 9.

shouider and abutting the free end of the sub-stage to limit the inward movement of the cell. The forward or reduced end of the cell is closed by It transparent plate 11, the front face of,which lies 5 bslontielly in the plane of the outer or front face of the stage so that a specimen holding plate or object 12 may lie in Contact or SubSt-illltlfllly in contact with the cell and thus be maintained in e cooled state.

The well of the rear or enlarged end of the .cell is formed by a cup 13 which has screw threaded engagement with the other portion of the shell, and is )rovided with on inwardly extending pocliet or o depression 14, the bottom of which is formed by e trenspon ent plate 15. Projecting from the rear well 13 end about the pocket or depression ll is an annular llong'e 16 which, preferably fits within the tube 2 and receives the ring 17 of tho condensing device.

As shown, the SllbSiiLS microscope con-- denser comprises it hollow frusto conical shell 18 having a flange 19 at its larger end formed with screw threads to engage the inner well of the ring 17, a pull of plane con vex lenses 20 and 21 being respectively arranged at the larger and at the smaller end of the shell, and having a sullicieut len th of focus to concentrate the light througi the cooling cell and upon the ob jcct. V fhon the condensing device and the cooling cell are connected, the tapered end of the former vrojocis into the pocket or depression in the letter so that the lenses of the condenser entirely surrounded by the cooling cell and the outer or forward lens 21 is substantially in contact with the plate 15.

To reguizzte the amount of light 2151 iris dia- It is apparent that rays passing through tile condenser Will elsobe compelled to pass through the cooling cell before reaching the specimen piete, thereby becoming cooled so that they will not act in e dcstructible man'- ner upon the object on the plate or upon the cement securing the sense.

were the cooling cell has been illustrated fem; of a eepare-te device it is to be understood that I do not wish to be limited to this construction es 1 consider myself to be the 'iirst to arrange e cooling device of any form in e position so teetit s ill contact with the object entitle stage,

i claim es my invention.

1. Ci; e comieinetion with a microscope and a condenser errenged to direct light rays to the microscope, of e cooling-cell arranged between the microscope and the condenser,

and means for holding the object in contact with the cooling cell,

2. combination with e microscope stege, of a. cooling cell having its front wall lying in the plane of the front wall of the stage.

3. The combination with a microscope stege of e cooling ceii projecting into the siege.

The combinetien Wit microscope end it microscope siege, of e cooling cell errangcd to contectu an object on the stage, and a condenser arranged to direct light rays through time ceii to the microscope.

5. The combination with s microscope and emece a stage, of a cooling chamber owing trensrays from an surrounding the condenser and,

projecting into the stage.

7. The combination with a microscope, a stage, and a substage condenser for the rays passing to the microscope, of a cooling cell receiving rays from and surrounding the said condenser.

8. A cooling cell for the rays from it microsco e condenser, formed with a pocket in one We said pocket a, transparent bottom.

9. A cooling cell for the rays from it microscope condenser comprising a central cylindricei portion; a reduced portion on one side thereof, iieving e transparent Well; end an enlarged portion on the otherrside, provided witia e elect having a transparent bottom.

1o. lie combination of e cooling cell heaving a pocket, and e mimoscope condenser erranged in the pocket.

11. Tlae combinetion with est-age having a- V sub-stage, of a -cooling eeil fitted in the sobstage, projecting into the sta -e and ineviog a trans arent well emiss-tentieily in tire *iene of the rent well of the stage and e pociet its opposite well provided with e tmcnepetent bottom, and e condenser secured to tics "eoei ing cell end projecting into the ocket.

WELL/Keel L. PAiTERSiQN. Witnesses:

Gsoeos H. Lemme, Lows M. Porrne. 

